Ultrasonic Communication Link?

[bobledoux]

Is anyone aware of an application that has used ultrasonic sound waves as a communication link? I'd like to send one byte of data a distance of 25 meters.

 

[crutschow]

Don't know of any application, but it would seem possible. Some of these ultrasonic transducers, for example, claim an operating distance of over 100'.

 

[audioguru]

I can whisper to somebody who is only 25m away. Why do you need ultrasonics?

 

[crutschow]

I can whisper to somebody who is only 25m away. Why do you need ultrasonics?

He wants to send a byte of data.

But, you certainly must have good ears if you can understand a whisper 25m away.

 

[audioguru]

you certainly must have good ears if you can understand a whisper 25m away.

Dead quiet no wind condition. Oh yeah, also when I hold my own breath.

 

[carmusic]

maybe it is possible but it requires a lot of power for 25m range since it is very low frequencies

 

[crutschow]

maybe it is possible but it requires a lot of power for 25m range since it is very low frequencies

The whisper or the ultrasonic?

 

[bobledoux]

I've found this one so far. It suggests using an ultrasonic send to a remote receiver. The receiver then pulses a light back to the sender. Distance measurement uses speed of sound and speed of light.

https://www.electro-tech-online.com/custompdfs/2010/12/ESP15_USp.pdf

 

[crutschow]

I've found this one so far. It suggests using an ultrasonic send to a remote receiver. The receiver then pulses a light back to the sender. Distance measurement uses speed of sound and speed of light.

https://www.electro-tech-online.com/custompdfs/2010/12/ESP15_USp-1.pdf

So for your purpose you don't need the light feedback circuit and the distance calculation. You just need the ultrasonic transmitter and receiver.

In that application they only show going to 1.5 meters, so you may need a stronger transmitter to go 25m.